521131824664 has 48 divisors (see below), whose sum is σ = 1074443718600. Its totient is φ = 236786161920.

The previous prime is 521131824643. The next prime is 521131824671. The reversal of 521131824664 is 466428131125.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 521131824664.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2422339 + ... + 2628685.

Almost surely, 2^521131824664 is an apocalyptic number.

It is an amenable number.

521131824664 is an abundant number, since it is smaller than the sum of its proper divisors (553311893936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521131824664 is a wasteful number, since it uses less digits than its factorization.

521131824664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208984 (or 208969 counting only the distinct ones).

The product of its digits is 276480, while the sum is 43.

Adding to 521131824664 its reverse (466428131125), we get a palindrome (987559955789).

The spelling of 521131824664 in words is "five hundred twenty-one billion, one hundred thirty-one million, eight hundred twenty-four thousand, six hundred sixty-four".